Remus couldn't stop, even when Severus said it hurt, even if he could feel his lover tense up with that pain. He was drawn inside, pulled by his own need and Severus' words claiming him. He groaned and stilled for a short moment when he was fully inside, just to relish it, to give the sensations and the realisation of what was happening time to sink in fully, to spread like fire in his body. Slowly he started moving, rolling his hips against Severus at a steady slow pace he knew wouldn't last for very long.
Then Severus moved, blowing Remus' mind and concentration to smithereens "Oh... god," he gasped out, faltering for a short moment as the friction and tightness around his cock increased. Remus locked eyes with Severus before he leaned in for a kiss. Thrusting his tongue into his lover's mouth, Remus picked up the pace again, although harder, deeper, grunting softly with the intense pleasure that washed through him with every stroke into Severus.